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Microwave Theory and Techniques, IEEE Transactions on

Issue 11 • Date Nov. 1972

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  • [Front cover - Nov. 1972]

    Publication Year: 1972 , Page(s): f1 - f2
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  • Unfolding the Lange Coupler (Short Papers)

    Publication Year: 1972 , Page(s): 777 - 779
    Cited by:  Papers (26)  |  Patents (5)
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  • Correction to "Scattering by a Ferrimagnetic Circular Cylinder in a Rectangular Waveguide" (Short Papers)

    Publication Year: 1972 , Page(s): 782 - 783
    Cited by:  Papers (3)
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    First Page of the Article
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  • Contributors, Nov. 1972

    Publication Year: 1972 , Page(s): 786 - 787
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  • Call for Papers, Nov. 1972

    Publication Year: 1972 , Page(s): 788
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  • Information on computer program descriptions

    Publication Year: 1972 , Page(s): 789
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  • [Back cover]

    Publication Year: 1972 , Page(s): b1 - b2
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  • Diffraction of a Wave Beam by an Aperture

    Publication Year: 1972 , Page(s): 749 - 755
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (584 KB)  

    The diffraction field of a wave beam from a circular and a rectangular aperture is obtained in the Fresnel region by using the Huygens-Kirchhoff approximation. The diffraction field in the Fraunhofer region can be obtained simply by replacing a parameter. The diffraction field is then expanded into a series of beam mode functions. From the field distributions and the expansion coefficients, which represent the coupling of the incident beam to the various modes in the diffraction field, the effects of an aperture on the incident beam can be known. With this mode expansion method, the conditions for optimum coupling between fundamental modes are obtained and solved numerically. View full abstract»

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  • Electrostatics of the Microstrip-Revisited (Short Papers)

    Publication Year: 1972 , Page(s): 756 - 758
    Cited by:  Papers (18)
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    The well-known integral-equation formulation of the microstrip problem is solved by a projective method using trial functions that preserve the essential singularity in charge distribution at the strip edges, Suitable computer programs are presented. This formulation is believed particularly useful in the analysis of strip discontinuities, where details of the charge distribution cannot easily be traded off against speed of computation. View full abstract»

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  • Anisotropy in Alumina Substrates for Microstrip Circuits (Short Papers)

    Publication Year: 1972 , Page(s): 775 - 777
    Cited by:  Papers (13)
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    By determining up to 16 GHz the effective dielectric constant for microstrip lines with various strip widths, it has been found that anisotropy in alumina substrates considerably affects the wavelength and is responsible for most of the discrepancy between theory and experiments, View full abstract»

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  • Synthesis of Quarter-Wave Coupled Circulators with Chebyshev Characteristics (Short Papers)

    Publication Year: 1972 , Page(s): 764 - 769
    Cited by:  Papers (21)
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    The purpose of this short paper is to give an exact theory of quarter-wave coupled circulators with Chebyshev characteristics. The synthesis starts by replacing the lumped-element equivalent shunt resonator of the circulator by a distributed one that has the same susceptance slope parameter as the original circuit. In this way the overall network involves commensurate transmission lines only. The bandwidth over which the assumed form of the equivalent circuit applies is carefully discussed in terms of the two split frequencies of the magnetized junction. Tables for the required circulator parameters and transformer admittances for one and two transformer sections as a function of VSWR and bandwidth are included. The realizable solution for the latter arrangement is severely restricted by the equivalent circuit of the basic junction. Experimental results on an octave-band stripline circulator, with a two-section transformer, are also included. View full abstract»

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  • Time-Delay Limits Set by Dispersion in Magnetostatic Delay Lines (Short Papers)

    Publication Year: 1972 , Page(s): 771 - 773
    Cited by:  Papers (1)
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    Analysis and experiments show the extreme dispersion of magnetostatic delay lines. A suitable parameter to characterize the amount of dispersion present has been found to be the maximum output energy contained in a time interval equal to the input pulse duration. The time occurrence of this maximum value gives a convenient measure of the group delay. The pulse shape and energy content versus delay have been determined both theoreticaly and experimentally for axially magnetized circular rods. The results show that delays beyond two to three times the input pulse duration cannot be obtained with more than 50 percent of the output energy contained within the original pulse duration. View full abstract»

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  • Analysis of the Power Loss in the Coupling Mechanism of a Cavity Resonator (Short Papers)

    Publication Year: 1972 , Page(s): 758 - 760
    Cited by:  Papers (2)
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    An analysis of a lossy coupling mechanism is presented. It is found that the reciprocal internal Q factor is augmented by a contribution (1 /2)ζ(l /Qex), where ζ depends on the Parameters of the coupling mechanism and Qex is the external Q factor. The theory is applied to analyze the coupling to a superconducting high-Q cavity. View full abstract»

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  • Hairpin-Line and Hybrid Hairpin-Line/Half-Wave Parallel-Coupled-Line Filters

    Publication Year: 1972 , Page(s): 719 - 728
    Cited by:  Papers (111)  |  Patents (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1368 KB)  

    A new class of microwave filters, hairpin-line and hybrid hairpin-line/half-wave parallel-coupled-line filters, is reported. This class of filters is particularly well suited for microstrip and TEM printed-circuit realizations because grounding of the filter resonators is generally not required. Hairpin-line filters have been divided into two types. The first (Type A) is characterized by having its input and output lines open-circuited at their ends. The Type A filter has been found to yield practical impedance levels for narrow to approximately 25-percent bandwidths. The second (Type B) is characterized by having its input and output lines short-circuited at their ends. However, because of space limitations, details of the Type B filter are not presented in this paper. Theoretical background and design equations for Type A bandpass filters are presented. Experimental data for several stripline filters of 5- and 20-percent bandwidths are given. Experimental results for two microwave-integrated-circuit (MIC) filters are discussed. View full abstract»

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  • The Green's Function for Poisson's Equation in a Two-Dielectric Region (Short Papers)

    Publication Year: 1972 , Page(s): 777
    Cited by:  Papers (1)
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    The validity of the reciprocity relation satisfied by the Green's function for Poisson's equation in a two-dielectric region is briefly discussed. View full abstract»

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  • A Series Transformation for Diaphragm-Type Discontinuities in Waveguide (Short Papers)

    Publication Year: 1972 , Page(s): 770 - 771
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (224 KB)  

    In treating the problem of the inductive/capacitive diaphragm in waveguide with the integral equation or the moments method, it is often necessary to compute the matrix elements of the guide dyadic in terms of the aperture eigenmodes of the diaphragm. A transformation of the original series is presented that displays superior convergence properties of the numerical solution. View full abstract»

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  • The Grazer Search Program for Minimax Objectives (Computer Program Descriptions)

    Publication Year: 1972 , Page(s): 784 - 785
    Cited by:  Papers (1)
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    The grazor search program is a package of subroutines that optimizes the designable parameters of networks or systems to meet minimax objectives. View full abstract»

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  • An Application of the Moment Method to Waveguide Scattering Problems

    Publication Year: 1972 , Page(s): 744 - 749
    Cited by:  Papers (14)
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    A moment method is suggested to solve scattering problems in waveguides. It takes advantage of the localized nature of the evanescent waves to assure the convergence of the solutions. The method chooses the point-matching approach with pulse basis functions so that it may be versatile and can be applied to discontinuities of an arbitrary shape. To illustrate this method, examples are given for open-ended parallel-plane waveguides, both flanged and unflanged, and for waveguides with obstacles of various shapes. Comparisons are made with solutions by other approaches and, whenever possible, with exact solutions. The agreements are good. View full abstract»

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  • Electronic Tuning of the Punch-Through Injection Transit-Time (PITT) Microwave Oscillator (Short Papers)

    Publication Year: 1972 , Page(s): 773 - 775
    Cited by:  Papers (1)
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    Experimental results of the dynamic resistance and capacitance of p+-n-p+ punch-through injection transit-time (PITT or BARRITT) diodes are presented. A method of predicting the oscillator electronic tuning from the change in the device capacitance is outlined and verified experimentally at X band. View full abstract»

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  • A Microstripline Slot Antenna (Short Papers)

    Publication Year: 1972 , Page(s): 760 - 762
    Cited by:  Papers (88)  |  Patents (2)
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    A microstripline slot antenna is treated experimentally at X-band frequency. First, the input impedances of the slots for various geometries and the radiation patterns for the matched slots are measured. Second, the dependence of input impedances and radiation patterns on the slot-to-reflector spacing is tested. Finally, a two-dimensional X-band Dolph-Chebyshev slot-array antenna is designed and fabricated as an application of this type of slot. View full abstract»

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  • Waveguide Bandstop Elliptic Function Filters

    Publication Year: 1972 , Page(s): 715 - 718
    Cited by:  Papers (25)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (280 KB)  

    Using the "natural prototype" for elliptic function filters, a design procedure is presented for a class of waveguide bandstop filters, which exhibit equiripple passband and stopband responses. Due to the availability of explicit formulas for element values in the natural prototype elliptic function filter, the design procedure is entirely analytic and does not require numerical synthesis techniques. The resulting physical structure is the familiar uniform guide with iris-coupled series stubs. Unlike the bandstop filters designed from maximally flat or Chebyshev prototypes, the elliptic function design results in stubs that are not exactly three-quarter-wave coupled. View full abstract»

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  • Equivalent Capacitances for Microstrip Gaps and Steps

    Publication Year: 1972 , Page(s): 729 - 733
    Cited by:  Papers (84)
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    The excess charge density distribution near gaps and steps in microstrip transmission lines is calculated by the solution of singular integral equations. Data are presented for gaps in microstrips of width-to-substrate-thickness ratios of 0.5, 1.0, and 2.0 and relative dielectric constants ranging from 1.0 to 15.0. For steps in a microstrip line results are given for width-to-thickness ratio of unity, relative dielectric constants of 1.0 and 9.6, while the change of width-to-height ratio is from 0.1 to 10.0. The excess charges are calculated explicitly in relatively short computing times, and the results are believed to be accurate to within a few percent. View full abstract»

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  • Dissipation and Scattering Matrices of Lossy Junctions (Short Papers)

    Publication Year: 1972 , Page(s): 779 - 782
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (368 KB)  

    The purpose of this short paper is to construct the dissipation and scattering matrices of lossy junctions in terms of the eigenvalues of the dissipation matrix. This removes the need to rely on inequality relations between the scattering parameters of lossy circulators. The eigenvalues of the dissipation, scattering, and admittance matrices are related. The eigenvalues of the dissipation matrix give the dissipation associated with each possible way of exciting the junction. The ones of the scattering matrix give the reflection coefficients associated with these different excitations. The admittance eigenvalues define in each instance the eigennetworks of the junction. This leads to the definition of the entries of the dissipation matrix in terms of the loaded and unloaded Q-factors of the junction eigennetworks. The scattering matrices of a number of lossy 3-port junctions are also constructed directly in terms of the elements of the eigennetworks. View full abstract»

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  • Propagation Characteristics of a Rectangular Waveguide Containing a Cylindrical Rod of Magnetized Ferrite

    Publication Year: 1972 , Page(s): 739 - 743
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    With an axially magnetized cylindrical ferrite rod inserted into a rectangular waveguide parallel to the E-field of the dominant (TE10) mode, the electromagnetic field amplitudes inside the ferrite rod and the transmission and reflection coefficients are numerically obtained by means of a digital computer and their results are shown in figures. At resonance, the distributions of RF magnetization and electric field have good symmetrical patterns in the cross section of the rod. The experimental results of the transmission and reflection coefficients agree well with the theoretical values. View full abstract»

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  • A Near-Optimum Matching Section without Discontinuities

    Publication Year: 1972 , Page(s): 734 - 739
    Cited by:  Papers (33)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (520 KB)  

    The optimum tapered matching section requires impedance steps at the taper ends, which exclude in most cases its application for synthesizing waveguide tapers. A new "near" optimum design is described which avoids the impedance steps and yields tapers only a fractional part longer in taper length (or narrower in bandwidth) than the exactly optimum taper. A table of values of a transcendental function has been calculated to simplify the synthesis. An example compares both types of matching sections. View full abstract»

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The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design..

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